Cambarellus alvarezi has been assessed as Extinct.This species was endemic to a single location, though this no longer exists, having undergone reduction due to water abstraction, and since 1994 has been permanently dry. Furthermore, this species has been surveyed for 10 times, over a period of 4 -5 years within known habitat, but no specimens have been found. The most recent visit to the site in 2009 confirmed there was no surface water at Ejido El Potosí.

This species is endemic to the spring of Ejido El Potosi, Galeana, in the state of Nuevo Leon, Mexico (Rodriguez and Campos 1994). It is only known from a single pond with a surface area of approximately 0.01 km² (Rodriguez and Campos 1994). In 2006, the type locality Ejido El Potosi was found to have no water in it, which was subsequently confirmed in 2009 (C. Pedraza-Lara pers. comm. 2010): This means there have been as many as 15 continuous years of desiccation at the only location this species is found.

This species has been surveyed for on 10 occasions, over a period of 4-5 years within the spring of Ejido El Potosi, Galeana, in the state of Nuevo Leon, Mexico, but no specimens have been found (M. López-Mejía., F. Alvarez. and C. Pedraza-Lara pers. comm. 2009).

This species is known from a single pond with an area of approximately 0.01 km2 (Rodriguez and Campos 1994). Miller and Walters (1972) described this pond as having clear water of varying depth and abundant vegetation. Furthermore, this species was most commonly found in the southeastern part of the pond, in association with plants of the Ceratophyllum genus(Rodriguez and Campos 1994). However, this location is now known to be completely dry (M. López-Mejía., F. Alvarez. and C. Pedraza-Lara pers. comm. 2009).

The pond habitat of this species is thought to have been relatively stable between 1960 and 1989 (Rodriguez and Campos 1994). However, since then, intensive pumping of groundwater for agriculture has led to a dramatic reduction in the size of the pond and the amount of aquatic vegetation that it supports (Rodriguez and Campos 1994, Contreras-Balderas and Lozano-Vilano 1996). Furthermore, this location is now known to be completely dry (M. López-Mejía., F. Alvarez. and C. Pedraza-Lara pers. comm. 2009), confirmed in 2006 and 2009 (C. Pedraza-Lara pers. comm. 2010).